"Eyepiece is in excellent condition,  cosmetically and optically.  Includes top and bottom dust covers".  

This is strictly a 2" Eyepiece. It does not include a 1.25" adaptor.

This Baader Planetarium 31mm Hyperion-Aspheric modular eyepiece is the world’s first astronomical eyepiece to use aspheric surfaces.  This new technology eliminates eyepiece aberrations without the usual penalty of extra lens elements, excessive size and weight, or high cost.  

Long eye relief for extreme comfort while viewing

The Baader Hyperion Aspheric eyepiece offers freedom from blackouts, kidney beaning, and lack of distortion.   The design also provides long eye relief, and produces a view that is uncommonly comfortable and natural for all users—even eyeglass wears and those who like to use devices that correct for astigmatism.

72 degree flat field of view

The ultra-wide 72° field of this Hyperion-Aspheric is extremely flat and distortionless.  It is virtually free of angular magnification distortion, providing you with unparalleled views of the Universe.  Phantom Group Multi-Coatings are applied to the optics to increase transmission and contrast, and thorough internal baffling keeps light from scattering.

 Baader Hyperion-Aspheric eyepieces are perfect for projection imaging

The Hyperion-Aspherics are threaded to accept the full line of Hyperion Digital T-Rings, for a robust direct attachment of almost any camera.  The clever use of 2 inch x 24 tpi SCT threads on the eyepiece body allows either this Hyperion-Aspheric to be threaded directly onto the rear cell of popular Schmidt-Cassegrain telescopes.  This results in the highest rigidity possible for imaging, and makes for one of the most flexible eyepieces on the market today.

• Eyepiece Series: Baader Hyperion

• Eyepiece Barrel Size: 2"

• Eyepiece Focal Length: 31 mm

• Eyepiece Apparent Field of View: 72º

• Eyepiece Eye Relief: 17mm

• Includes Dust Caps: Yes